All the President's men- How can this movie be seen as showing both the best and the worst of American society?

It was an American disgrace to learn that the President of the United States was, in deed, a crook! Two young and determined reporters from the Washington Post discovered the White House link with the Watergate affair.

"In the final scene, set on January 20, 1973, Bernstein and Woodward type out the full story, with the TV in their office showing Nixon taking the Oath of Office, for his second term as President of the United States, in the foreground. A montage of Watergate-related teletype headlines from the following years is shown, ending with Nixon's resignation and the inauguration of Vice President Gerald Ford on August 9, 1974."

The "best" thing to come out of the entire mess was that wrongs were righted and the truth prevailed.

Because of characterization.